This teacher's guide is the grades 7-9 unit for population education developed for the Baltimore public schools. This mini-demography course covers various factors of population growth and change. The activities of the unit focus on seven major concepts: (1) demography provides information for understanding population growth, trends, and changes; (2) the world is involved in a population explosion; (3) world population grows when the birth rate is higher than the death rate; (4) the earth can support only a certain number of people; (5) population is becoming more concentrated in urban areas; (6) the age structure of a population is an important index of population growth; and (7) personal decisions have demographic consequences. Twelve subunits comprise the major unit. Each contains topic, concepts, objectives, activities, materials needed, and conclusions. The units use graphs, charts, and a few statistics. (Author/JR)